在第三章中，为了更好的讨论系统的全局拓扑结构，本文首次引入双扇形区域的概念；
In order to achieve a better understanding of global structure of the system, first, we introduce a new concept that is called double sector region in chapter III.
在第三章中，为了更好的讨论系统的全局拓扑结构，本文首次引入双扇形区域的概念；
In order to achieve a better understanding of global structure of the system, first, we introduce a new concept that is called double sector region in chapter III.
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